Electrical motor



July I, 1930. T. P. KIMMAN ELECTRICAL MOTOR Filed May 29, 1926 I N VEN TOR P K/mmam ATTORNEY.

Ti .5 7/7 0/ 58y @0 are ap earance.

Patented July 1, 1930 UNITED STATES PATENT OFFICE THEODORE r. KIMMAN, or CLEVELAND, OHIO, ASSIGNOB 'ro oHicAeo rNEUMA'rIc 'rooL comraiw, on NEW Yonx, N. Y., A CORPORATION or'nnw JERSEY ELECTRICAL MOTOR Application filed May 29,

This invention relates to electrical motors and more specifically to the armatures thereof. It particularly concerns wire wound armatures especially the drum wound type but is by no means necessarily limited to the same. I

In armatures of the type described ortions of the coils disposed in the grooves o the armature core protrude beyond the end of the core. It has been the usual practice heretofore on small armatures to hold the protruding portions of the coils against centrifugal force b rings cutfrom brass or bronze tubing. onsiderable difiiculty has been experienced in keeping such rings from sliding or working off the coils after the armatures have been in use for some time. Moreover the practice of bindin or otherwise securing such rings at interva s to the coils fa1ls to give the armature a finished or an attractive ne object of the invention' is to secure the exposed portions of the coils of armatures in place ,in a more effective manner. Another object is to provide means for this purpose which cannot come ofinor allow the coils to expand in runnin Anothenob ect is to simplify and to expe ite the application of such means. Another object 15 to improve the appearance of the finished armature. Other objects will be apparent from the detailed description which follows:

Typical species of the genus constitut ng the invention are shown in the accompanying drawings, in which:

Fig. 1 is a side elevational view of a completely assembled armature shaft.

Fig. 2 is an end elevational view of one of the end rings used on the armature core of Fig. 1.

Fig. 3 is a vertical sectional view on the line 1926. Serial no. 112,518.

Fig. 8 is a sectional view similar to Fig. 7 showing another modification.

Fig. 9 is an enlarged sectional view, similar to Figs. 7 and 8 showing still another form of invention. c

. Fig. 1 illustrates the appearance of an armature shaft provided with retaining members or end rings of the type comprising the present invention used to enclose those portions of the coils or windings of the armature core which protrudefrom the ends of the latter. The armature shaft 10 is of the usual type having a bearing portion 10 at one end and shaped to form a pinion 1O at the other. Adjacent the pinion end is a fan 10. The armature core 11 shown is of the laminar type and at the ends of the core enclosing the protruding loops or coils 12 of the windings (Figs. 4-9) are the retaining members or end rings 13. The form of end ring disclosed in Fig. 1 is more clearly shown in F igs 2 and 3. It is of thin sheet material, preferably soft metal such as copper or brass, and Viewed from its interior is formed with an outwardly inclined wall 13 which terminates in an inwardly turned flange portion 13", thereby providing an outwardly directed annular recess 13. When the ring is applied to the armature the edge13 (Fig. 3) is adjacentor abuts the armature core and the inturned flange portion 13 forms the outer retaining wall for the coils 12. The coils are,

arranged to fill recess 13 thereby engaging the inclined wall 13 and holding the ring in place.

The manner of applying the end rings dis closed in Figs. 1, 2 and 3 is shown diagrammatically in Figs. 4, 5 and 6. A guide sleeve X (Fig. 4) telescopes over armature shaft 10 and serves to maintain the protruding coils 12 in spaced relation to the shaft. This sleeve may, of course, be placed upon the shaft before the winding operation or before the coils are inserted, if desired; An outer sleeve Y (Fig. 5) is then. passed over the shaft and partly telescopes over the core 11. End ring 13 is slipped over coils 12 within outer sleeve Y (Fig. 5) and plunger member Z is slid along sleeve X and partly telescopes within member Y (Fig. 5). Member Z is then forced home to the position shown in Fig. 6 compressing coils 12 between sleeves X and Y, and driving them up into the recess 13 of end ring 13, the outer flange 13 of the latter being engaged by member Z and pressed into tight engagement with the compressed coils. lVhen both rings are applied as described the armature shaft appears as shown in Fig. 1, end rings 13 not only covering and holding the protruding coils in place but also covering the ends of the retainer strips 12 which hold the coils or windings within the axial recesses of the armature core.

Fig. 8 shows a slightly different form of end ring 1 1 in which the retaining surface 11 engaged by the compressed coils is of somewhat less extent than that shown in the first form of ring, which surface is produced by forming the interior of the ring with a circumferential depression 14 substantially centrally of the ring. It addition the outer flanged portion 14 is substantially at right angles to the body of the ring and is arranged to engage the exterior of the compressed coils rather than to be partially imbedded in the same as shown in Fig. 6.

Fig. 7 illustrates a form of end ring differing from the forms previously described. This ring 15 has a still more restricted retaining surface 15 which is formed by an annular groove 15 formed in the exterior of the ring and producing an interior shoulder projecting into the compressed mass of coils. This ring has an inturned flange 15 at its outer end which serves as a retainer for the supplemental interior ring 16 which entirely covers the outer face of the compressed coils.

Fig. 9 illustrates a form of the invention in which concentric, partly nesting interior and exterior rings 17 and 18, respectively entirely enclose the protruding portions of the coils or windings 12. In the present instance the holding or retaining function is entirely accomplished by the outer ring 18 which in general resembles the form of the invention first described except that its outer end flange 18" is of greater extent and projects over the opposing flanged portion 17- of the inner ring. The retaining effect of the coils is produced by the outwardly inclined surface 18 of the outer ring with which the compressed coils 12 directly engage.

The forms of the invention disclosed in Figs. 7, 8 and 9 are applied to an armature by obvious variations of the method diagrammatically illustrated in Figs. 4 and 6. In order to insure that the more extensive outer flanges of the last described end rings be arranged to engage the outer face of the mass of coils, the compressing of the coils may be performed in steps, a pre-compression step placing the mass in the general form desired prior to the application of the rings and a final compression step after the rings are in place. In the form shown in Fig. 7 the anthe present invention provides means for effectively enclosing and protecting the parts protruding from the ends of an armature core, such as the coils or loops of the windings and the ends of the insulating strips closing the armature slots, that these rings may be so shaped as to be effectively retained in place when applied in accordance with the method herein disclosed, that centrifugal force operates to hold the rings and coils more effectively in place, and that the present invention provides a simple, efficient, and workmanlike solution of a problem in finishing drum wound and similar armatures.

lVhile preferred forms of the invention have been herein shown and described it is to be understood that the invention is not limited to the specific details thereof but covers all changes, modifications and adaptations within the scope of the appended claims.

I claim as my invention:

1. The method of securing a retainer ring formed with an inclined wall to an armature so as to enclose and retain the coils thereof in place which comprises slipping the retainer ring over the protruding portions of the coils at the ends of the armature core and compressing said protruding coil portions toward said core to force them within said ring and against said inclined wall thereby to effect interlocking engagement of said coils and said ring.

2. The method of securing a retainer ring having an inclined wall forming an annular pocket to an armature so as to enclose and retain the coils thereof in place which comprises slipping the retainer ring over the protruding portions of the coils at the ends of the armature core, centering said coil portions and said ring relative to the armature shaft and compressing said protruding coil portions toward said core to force them within the annular pocket of said ring and against said inclined wall thereby to effect interlocking engagement of said coils and said ring.

3. The combination with an armature core having coil loops protruding from the end thereof, of a retaining ring inclosing said protruding coils and presenting an annular wall of (.lecreasing diameter toward said core, said coils being expanded to engage said wall so as to prevent removal of said ring.

The combination with an armature core having coil loops protruding from the end thereof, of a retaining ring inclosing said protruding coils and formed on its interior with an annular recess of greater diameter than the ring opening adjacent said core, the

coils extendin into said recess so as to hold said ring against removal.

5. The combination with an armature core thereof, of concentric rings enclosing the I protruding loops, said loops being compressed between said rings, at least one of said rings presenting an inclined retaining surface engaged by said loops for preventing removal of said rings.

7. The combination with an armature core having coil loops protrudin from the ends thereof, of nested inner an outer rings enclosing the protruding loops, and means preventing removal of said rings comprising an annular recess in one of said rings into which said coils are compressed.

8. The combination with an armature core having coil loops protruding'from the ends thereof, of opposed concentric rings enclosing the protruding loops, said loops being compressed between said rings, one of said rings serving as the retainer for the other ring, and means on said retainer ring engaged by said compressed loops for prevent ing removal of said retainer ring.

9. The combination with an armature core having coil loops protruding from the ends thereof, of opposed concentric rings enclosing the protruding loops, said loops being compressed between said rings, the inner ring being at least partly nested within the outer ring, and a retaining surface on said outer ring engaged by said compressed loops for retaining the rings in place. 7 10. The combination with an armature core having coil loops protruding from the ends thereof, of opposed concentric rings enclosing the protruding loops, said loops being compressed between said rings, the outer ring partly inclosing the inner rin and having an outwardly directed annu ar recess into which said loops are forced to retain said rings in place.

11. The combination with an armature core having coil loops protruding from. the ends thereof, of a retaining rin inclosing said protruding coils and providing on its interior an outwardly directed recess into which said coils are expanded thereby to effect engagement of said ring and coils and to utilize the effect of centrifugal force upon said coils to assist in holding the ring in place.

Signed by me at Cleveland, in the county of Cuyahoga and State of Ohio, this 19th day of May, 1926.

THEODORE P; KIMMAN. 

